Perforable bung ring structure



June 27, 1933. w. c. GROSSER h 1,915,310

l PERFORABLE BUNG RING STRUCTURE Filed July 6, 1951 terials, and more particularly sion of means for completely :w patent for container closure seals,

'Patented June, 2.7, 1933 AUNITED -STA-:I`ES

PATENT olFFlcs WALTER C. GROSSER, 0F CLEVELAND, OHIO;` ASSIGNOR TO THE DRPEB MANUFAG- TUBING COMPANY, 0F

CLEVELAND, OHIO, A CORPOFIATION OF OHIO PERFORABLE BUNG RING STRUCTURE Application filed July 6, 1931. Serial No. 548,987.

The invention relates to closures for the bung openings of metallic barrels, drums, v essels, packages `or containers ut1lizedfor shipping and/ or storing liquid or.` semi-solid inato ,the providraining .the contents of a container having an internally projecting bung ring equipped w1th a dual seal as shown in my application for iled April 20, 1931, Serial No. 531,292, upon which the present invention is an improvement.`

Liquid or semi-solid materials are unlversallyshipped in containers which also act.

as storage vessels for the materials. Accordingly, it is frequently desirable if not necessary to provide a dual seal 1n container closure construction including a sealing closure member seated by the usual plug in a container bung ring to prevent undetectable access to and removal of the contents of such containers and to provide a liquid seal for said theft indicating closure member, to prevent leakage between the bung ring and theft indicating closure member, as set forth in said application, Serial No. 531,292.

However, the provision of such a dual seal in container closure construction may require the bung ring to project a substan-V tial distance into the container, which mayA prevent the contents of the container from being completely drained when the container is turned upside down for being emptied, because in such a position the bung ring projects up-ward into the'container and a small quantity of the contents of the container remains below the level ofthe annular edge of the-inner end of the bung ring.

A container bung ring has commonly beenl provided with apertures in the corner between its flange seamed to the container wall and its threaded ringportion, for permitting the remaining moiety of the container contents to drain out through the apertures when the container is. turned upside down for being emptied.

However, such apertured bungring con# struction cannot be used in connection with a dual seal closure because the apertures would permit egress of the contents of the' container therethrough beyond the dual seal, lthus defeating the purpose of the dual seal and rendering the same useless and superfluous.

It is therefore an object of the/present in-' vention to provide a container having a dual sealed bung ring projecting a substantial distance therein with means for permitting the container contents to be completely drained. This may be accomplished by forming the container bung ring with one or more perforable thin-walled zones at the corner between its flange seamed to the container wall and its 'threaded ring portion. These thin-walled Zones may then be readily perforated or punctured by the person empt ing the container to completely drain tde contents therefrom.

Moreover, it is a further object of the present invention to provide a simple, inexpensive and convenient method for making bung ringswith perforable thin-walled Zones by forming a perforated disk blank, drilling one or more holes partially through the blank so as to leave a thin wall at the bottom of the hole and drawing the blank to form a ring portion and an annular flange portion, and locating the axes of the drilled holes in a circumferential line substantially coinciding with the corner between the ring and flange portions.

rlhese and other objects may be attained by the methods, combinations and structures, preferred embodiments of which are here-inafter described in detail, and shown in the drawing, in which Figure 1 is a plan View of a perforatedgdisk bung ring blank in which two holes for forming thin-walled zones therein have been drilled partially through the blank;

Fig. 2 is an axial section through the bung ring blank on the line 2-2, Fig. 1;

Fig. 3` is an enlarged view of a portion of Fg- 2;

ring formed by drawing, threading and machining the blank shown in Fig. 1;

Fig. 5 is an aXlal section through a dual9 sealing cap or closure member;

Fig. 6 is a section through a container wall ring shown in Fig. 4 is e sealin member of Fig.

osure plug about 'to which the bung seamed, showing t i 5 assembled therein and a c to be threaded therein;

Fig. 7 is an enlarged view of a portion of Fig. 6; v

Fi 8 is a view similar to Fig. 6, but showing t e plug threaded into the bung ring locking the sealing member in dual sealing relation in the bung ring;

Fig. 9 is an enlarged view of a portion of 8; ig. 10 is a section through a container Wall, showin a way in which the thin-,walled zone of the ung ring may be perforated or unctured with a pointed tool after removlngthe plug and sealing member; igll 1s an enlarged view of a portion of Fig. 10; 2Q Fig. 12 is a section through a fragmentary portion of a container turned upside Idown for `completely draining the contents of the same. through the perforated thin-walled zones; and l Fig. 13 isan enlarged vlew similar to Fig. 7 showing an alternate manner of providing a container bung ring with thin-walled zones. Similar numerals refer to similar parts so throughout the various figures of the draw- The improved perforable bung rin structure is preferably made from a dis blank (Fig. 1) provided in the usual manner with a central a rture 16. One or lmore holes 17 are pre erably drilled in the disk blank 15 partially through the same in such a .manner that a thin wall 18 integral with 1thebody of the. disk blank remains at the bottom of the holes 17 When the holes 17 Q #ne formed lby drilling, the thin walls 18 at tho boaom of the holes win bo Slightly conf caved downward somewhat as well shown at The dis blank 15 is then placed in a ress l 45. and drawn to form a bung rmg general y in-4 dicated at 19 having a rlng portion 20 terminating at 'one end in an inwardly rojec'tingannular flange 21, and at the ot er end i'n an outwardly projecting annular, seam 450 flange 22 fromv which a substantially cylindrieal seam clamping portion 23 pro3ects. The ring portion 20 is then internally threaded at 24'and the outer cylindrical surface of the clamping portion 23 is machined at 23' 65. so as to reduce the thickness of the s'ame for realdly seaming the bung ring to a container wa The bun ring 19 .is then seamed toa contniner walf25, at 26, by clamping the por- Q tions 22 and 23 to the annular curled edge 27 of a bung opening formed in the container 25, as shown in Fig'. 6. i

A'bung o ning closure plug is indicated at 28 and inc udes an exteriorly threaded por- ,tion 29, avflange 30, preferably shaped to revceive a wrench, and a wrench receiving socket 31, the lower end of the threaded portion l 29 being bevelled, tapered or chamfered as indicated at 32.

. A cup-shaped metallic sealing element generally indicated at 33" (Fig. 5) which includes a disk bottom 34 and a circumferential' rim flange. 35 provided with an annular shoulder 36 provides the dual seal for the bung opening. A layer of sealing gum, or a sealing gasket formed of fibre, rubber or other liquid sealing material, indicated at 37 is preferably fixed, glued, cemented or otherwise attached to the outer surface of the sealing element rim ange 35 and s houldert36.

In assembling the closure parts, the lement 33 is first inserted into the bung ring opening so that the shoulder 36 thereof, faced by the liquid sealing material 37 vrests on thebung flange 21 (Figs. '6 and'7). The closure plug 28 is then threaded into the threaded bung ring until the bevelled end -32 of the plug engages the upper annular edge of the cup rim 35.' As the plug continues to be threaded into the bung ring, the rim 35 is placed underaxial compression so that the cup-shaped sealing element is pressed downward and is self-locked'to and seated against the bung ange 21, and the liquid sealing material 37 is squeezed in liquid tight sealing relation between the shoulder 36 and lbung flange 21 (Figs. 8 and 9).l

Moreover, the plug threads 29, cooperating with the bung threads 24, (Figs. 8 and 9) form threads 38 in the liquid sealing element rim flange 35, which are pressed or seated against the bung .ring threads 24 adjacent the flange 21 thereof. Moreover, the`1iquid sealing material 37 is squeezed in liquid tight sealing relation between the threads 38 and bung ring threads 24, and the threads 38 maintain the rim 35 under compression so that the element-33 is in liquid tight sealing relation within the bung openin and the disk bottom 34 thereof forms a t eft indicating seal for the bung opening, it being necessary to puncture the disk bottom 34 1n order to gain access to the contents of lthe container. The sealing element 33 thus provides a dual seal for the bungopenipg.

lAlthough a contalner provided with a seated sealing element 33, and with the plug 28l removed, will withstand a ressure of at least ten pounds r square inc from within the container without leaking between the seal- 120 ing elemeit and the brflg ring, yet in mostiy cases the ping 28 remains during shipment and storage within the bung opening and suicient clearance is provided between the lower end of the plug and the upper surface `125 of the disk bottom 34 so that the usual closure gasket 39-is clamped inliquid tight sealing relation between the container wall 25. r The holes 17 are so located in thedisk 130 plug flange 30 and the upside down as shown in blank 15 so that in forming the bung ring 19, the axes A of the holes 17 are located in a circle indicated by dot-dash lines in Fig. 1 at-B, which substantially coincides With the corner 40 formed between the ring and flange portions 2() and 22 respectively of the bung ring.

Aceo1dingly,-wl1en the bung ring 19 is formed, the originally cylindrical holes 17 are distorted so that p-erforable thin-walledzones 41 result near the outer endof the completed bung ring adjacent the corner 4() thereof above the sealing element 33 and intermediate the bung ring flanges 21 and 22.

When it is desired to gain access to the contents of the container, the plug 19 is removed, and the sealing element 33 is punctured by a suitable tool and removed from the bung opening, whereupon the contents of the container may be drawn off through the bung opening. At this time the thin-walled zones 41 may be readily perforated, pierced or punctured at 41a by any suitable pointed tool, as by a nail indicated in dot-dash lines in Fig. 10, so that when the container is turned Fig. 12, the entire container contents may be drained out through the punctured apertures 41a excepting only an insignificant amount indicated at 42, the level of which is shown in Fig. 12.

A slightly modified form of the invention is shown in Fig. 13 in which the holes 17a originally drilled in the disk blank for forming the bung ring 19a are drilled entirely through 'the disk blank. vAfter the bung ring 19a is completely formed, threaded and machined, the inner ends of the holes 17a are closed and sealed with soft solder indicated at 4119 to provide readily perforable thinwalled zones therefor.

Accordingly, the present improvements provide a closure constructwn which will give avisible signal that solneone has attempted to gain access to the contents of the container if the container' is received by an authorized person and discloses any distortion or puncturing of the sealing element 33 or of the thin-walled zones 41, because it is necessary to puncture the same in order to gain access to the contents of the container. However, the sealing element 33 and thin-walled zones 41 may be readily, quickly and easily punctured by any authorized person in order to gain access to the contents of the container and to completely empty the container when desired. Y

Moreover, after the container has once been used it still has a salvage value and it may be filled and refilled time after time and closed by the plug 28 seated inliquid tight sealing relation in the usual manner by the usual sealing gasket 39.

1. In closure construction for acontainer having a wall, a bung ring projecting from said Wall, a theft indicating closure member locked in liquid tight sealing relation within said. bung ring, and a perforable thin-walled zone in said bung ring above the closure mem ber and adjacent to said wall.

2. In container closure construction, a threaded bung ring, a theft indicating closure member locked in liquid tight sealing relation to said bung ring threads at the inner end of the bung ring, and a perforable thin-walled zone in said bung ring near the outer end thereof above the closure member.

,3. In container closure construction,

portion Wi a theft indicating h a corner formed therebetween, closure member locked 1n liquid tight sealing relation within the bung ring, and a perforable thin-walled zone adjacent said ring corner.

4. In closure construction for a container having a wall, a bung ring projecting from said wall, a theft indicating closure member locked in liquid tight sealing relation within the bung ring, a plug for the bung ring, a sealing gasket between said plug and ring, and a perforable thin-walled zone in said bung ring intermediate said sealing memberuand sealing gasket and adjacent to said wa 5. In closure construction for a container` having a Wall, a bung ring provided with an inwardly projecting flange and an outwardly projecting flange, a theft indicating closure member locked in liquid tight sealing relation against said inwardly projecting ange, said outwardly projecting iange' being secured to said container wall, and a perforable thin-Walled zone in said bung ring intermediatesaid flanges and adjacent to said wall.

In testimony that I claim the above, I have hereunto subscribed my name.

WALTER C. GROSSER.

abung ring having a ring portion and a seam flange 

